public class E_3{
    public static void main(String[] args) {
        long[] a={1,2,3,4};
        long[] b={100,200,300,400,500};
        b=a;
        System.out.println("数组b的长度："+b.length);//代码1
        System.out.println("b[0]="+b[0]);//代码2
    }
}